Film-burster.



G. P. SHAW.

FILM BURSTBR. APPLICATION FILED DEG. 29, 1913.

1,102,807. Patented July 7, 1914.

L TToRNEy THE NORRIS PETERS CO.. PHOTO-LITHOH WASHINGTON. D. C.

G. P. SHAW. FILM BURSTBR. APBLIQATION FILED mm. 29, 1913.

1,102,807. Patented July '2, 19m

2 SHEETS-SHEET 2.

f v k v 1km? Xww3 THE NORRIS PETERS C0,. PHOTU-LITHQ, WASHINGTON, D. C-

' UNITED STATES PATENT. @FFTQE.

CHARLES P. SHAW, OF DETROIT, MIGLEL'IGAN.

FlLlllI-BURSTEB. I

nioasor.

Application filed December 29, 1913.

To all whom it may concern Be it known that l, Crmnnns P. SHAW, a citizen of the United States, residing at Detroit, county of Wayne, State of Michi gan, have invented a certain new and useful Improvement in F ilm-Bursters, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to film bursters or pop-guns and has for its object a gun adapted to break a hole in paper held under tension and thereby cause a report. This result has been accomplished heretofore in the art, but I propose to do it in a way that I believe to be novel. The exhaust hole is in the side of the gun and not in the end, thereby eliminating danger from the presence of things in the barrel of the gun which may accidentally have found their way there. This arrangement also allows the use of a strip of paper that is pointed parallel with the barrel of the gun, presenting a better resemblance to reality than is the case where the strip of paper extends across the end or the barrel.

In the drawings: Figure 1, is a longitudinal section of the barrel. Fig. 2, is an elevation of the barrel showing the gun broken to retract the plunger. Fig. 3, is the top plan View of the barrel, a portion of the barrel being cut away. Fig. 4, is a sect-ion on the line AA of Fig. 1. Fig. -5, is a detail of the draw link. Fig. 6, is a side elevation of a modified form of pop-gun. Fig. 7, is a top View of the end of the barrel of the same. Fig. 8, is a side view of the end of the barrel partly in section. Fig. 9, is a section on the line BB of Fig. 8. Fig. 10, is a bottom elevation of the end of the barrel.

The barrel of the gun is designated a.

6 indicates the stock that is pivoted to the barrel of the gun at c.

A plug cZ closes the forward end of the barrel and is provided with an axial bore 0 and a lateral bore f. The lateral bore is the discharge opening. The axial bore leads to it. The substance of the plug about the opening into the axial bore forms a shoulder 9 that acts as a stop for the plunger h. The plunger rod 2' is secured to the plunger h and terminates in a hooked end 3'. The

Specification of Letters Patent.

Patented July I, T91 1.

serial No. 8%,1429.

plunger rod is bent to reach around the stop pin Z: that protrudes through the center of the barrel from side to side to act as a stop for the spring Z. The spring Z coils about the forward end of the plunger rod and presses against the plunger. i Vhen the hook j is released the spring Z forces the plunger it forward in the barrel to the position shown against plug (Z which stops it.

The trigger in is normally held in position shown in Fig. 1 by means of the spring a. The forward end of the trigger which protrudes into the barrel has a catch 22 inside. The draw link 0 is provided at its forward end with a foot g] which causes it to normally ride about along the axis of the barrel. When the gun has been discharged the hook j will be in the position shown in dotted lines of Fig. 1. When the gun is broken this draws the link 0 backward by reason of its being pivoted at the interior f the stock. The parallel arms of the link 0 straddle the hook 7' and hence engage the hook as the link is drawn back. When the catch 79 is reached in the retraction of the link the hook overrides the catch ya and the catch flies back into place and holds the link j thereby cooking the gun.

A band r fits over the end of the barrel. The two ends of the band are bolted together beneath the barrel by the bolt and nut Ears t are turned in to engage over the track a which is an inclined track suspended from the plug (5, and lower at the forward end than at the rear end. The bolt .9 engages with the underside of the track. The end of the track a is turned over to form a stop 4;. Hence by sliding the band 0" along the barrel of the gun the band is caused to rise as shown in Fig. 2. This allows the insertion of a strip of paper to. When the band is slid back the cam arrangement formed by the track a, the ears t and the bolt 3 serves to tightly force the top of the hand against the top of the barrel to make an air tight fit of the paper upon the top of the barrel about the discharge opening f. Tence when the trigger is pulled and the plunger 71- is forced forward by the spring Z the air is compressed ahead of the plunger and when a given pressure is reached (de pending upon the strength of the paper) the paper breaks andgives a loud report. The band r may again be pulled away from the hole and the paper strip 10 shifted to bring an unbroken port-ion above the discharge opening f. The gun may again be cocked and the trigger pulled.

Although it is not necessary I have provided automatic means for sliding the band (the band and the cam devices will in the claims be called the paper holder). This automatic device comprises a pair of reach rods to fixed to each side of the band and extending to the un stock d where they are pivoted on the forward side of the fulcrum 0. Hence by the breaking of the gun the holder '1" is released and the paper may be shifted along and when the gun is restored to its normal position the holder 1 again presses the paperabout the hole f. 7

Figs. 6, 7, 8, 9, and 10 show my preferred form of construction for the holder. The

band 7" is practically the same as shown in the first sheet of the drawings. The transverse recess y is provided in theend of the barrel and in the plug d. A cam roll .2 is

journaled in the end of the band 1" and ter-' minates in a crank arm. By turning this crank arm down as shown in Fig. 9 the band is tightly clamped to the paper w by reason of the surface of the cam roll engaging the surface of the recess and when the crank arm is turned up as shown in Fig. 6 the cut-away portion of the cam roll is adjacent the wall 2. In a pop-gun, the combination of a bar-' rel provided with a lateral hole near its outer end, a plug fixed in'the outer end provided with an axial passageway and a lateral passageway registering with the lateral hole of the barrel, a plunger within said barrel for forcing air out through said lateral hole, the said plug acting as a stop to said plunger, and'means for clamping paper upon the outside of the barrel adjacent the said lateral hole, substantially as described.

3. In a pop-gun, the combination of a barrel provided with a lateral opening,- aplug.

in the end of the barrel, means for forcing air through the lateralopening, and a paper holder for clamping paper upon the barrel adjacent said opening, the said paper holder comprising a band and means for loosening and tightening said band, substantially, as

described.

a. In a pop-gun, the combination of'a barrel provided with a lateral opening, a plug in the end of the barrel, means for forcing 2111 through sald lateral openlng, and a holder for clamping paper about said lateral opening comprising a hand and a cam roll engaging with the bottom of the barrel to loosen or tighten the band upon the paper, substantially as described.

5. In a pop-gun, the combination of a barrel provided with a lateral opening, a plug in the end of the barrel, means for forcing air through said lateral opening and means for clamping the paper about said lateral;

opening comprising a band, a cam roll jour Copies of this patent may be obtained for fivecents each, by addressing the Commissioner of Patents,

' Washington, 1). 0. 

